Electromagnetic Simulations of High Dielectric Materials at 7 Tesla

Wouter M. Teeuwisse¹, Chris M. Collins², Nadine B. Smith¹, Andrew G. Webb¹

This work presents the results of electromagnetic simulations to study the effects of different high dielectric materials, size, geometry and position on the RF field distribution within the head at 7 Tesla. Local increases in signal-to-noise from materials with high dielectric constant are balanced by much smaller global decreases further away from the material. Splitting up the dielectric into several smaller subunits reduces the very strong wavelike behaviour that can occur when using materials with very high dielectric constants.